Adjustable tripping device



Nov. 1, 1932'. N. w. DORMAN 1,885,420

ADJUSTABLE TRIPPING DEVI CE Filed March 5, 1931 Patented Nov. 1, 1932UNITED STATES NEAL W. DORMAN', F TOLEDO, OHIO, ASSIG-NOB TO THE TOLEDOMACHINE & TOOL COM- PATENT oFFic PANY, 0F TOLEDO, OHIO, A CORPORATION OFOHIO ADJUSTABLE [DRIPPING DEVICE Application filed. March 5,

ally comprises a vertically disposed plunger carrying a roller which isadapted to ride in a peripheral channel formed in the shiftable clutchmember. This plunger is raised by means of a trip lever to permit theclutch 16 to operate and start the rotation of the cam or crank shaft.lVhen the plunger is released it drops back into position to cause theclutch to be disconnected at the completion of the usual cycle ofoperation.

The object of the present invention is to simplify and otherwise improvethe means by which the tripping device is adjusted so that the clutchwill be disconnected at the proper time. It permits a more preciseadjustment than is possible with constructions heretofore used and theadjustment may also be made in less time.

The invention will be more particularly described in connection with theaccompanying drawing, in WlllCl1- tion, the crank shaft and shiftableclutch member being partially shown in section.

Figure 3 is a section taken on the line 3-3 of Figure 1.

Figure 4 shows the clutch when released by the trip.

As illustrated in the drawing, the invention is associated with a powerpress having a frame 5 and a crank shaft 6, on which is splined ashiftable clutch member 7 adapted to be moved by springs 25 intoclutching engagement with a companion member loose on the shaft 6. Theshiftable clutch member 7 has a peripheral channel 8 adapted to receivea shifting member 9 which is usually in the form of a roller carried atthe lower end 1931. Serial No. 520,280.

of a vertically reciprocable plunger 10. This plunger near its upper endis formed with a neck 11, which is received between the arms 12 of abifurcated trip lever 13 fulcrumed at 14 on a bracket 15 secured to theframe of the press. The outer end of the trip lever 13 is usuallyconnected by a rod 16 to a pedal by means of which the tripis actuated.

Heretofore it has been customary to form the neck 11 with flat faces sothat it is nonrctatably held between the arms 12 and to mount the roller9 eccentrically on the plunger 10 so that the trip device may beadjusted by arotational adjustment of the plunger. With such aconstruction, in order to efiect the adjustment, it is necessary toremove the trip lever 13 and the number of positions of adjustment is,of course, limited by the number of fiat faces on the neck 11. Accordingtothe present invention, however, the adjustment may be effected withany degree of precision and in doing so it is not necessary 17 which isrotatably adjustable in a split bearing 18 secured to the frame of themachine. The bushing 17 is clamped in adjusted position by means ofbolts 19 which extend transversely across the split bearing. Wheneverbolts 19 are loosened, the bushing 17 may be adjusted circumferentiallythrough any angle by the application of a proper tool to the head 20formed at the lower end of the bushing. The bolts engage circumferentialgrooves in the bushing, thus preventing the latter from droppingdownwardly when the bolts are loosened. In my construction, the neck 11is cylindrical and there is sufficient clearance between the neck andthe arms 12 to permit the bodily adjustment of the plunger laterally asfar as is permitted by the eccentricity of the bushing 17 and the head24: is wide enough to be always engaged by the arms 12.

The plunger 10 is normally held down bya weight 21 pivoted at 22 to thebracket 15 and resting by gravity on the upper end of the plunger. By anactuation of the trip lever 13, the plunger may be raised to permit theclutch to be moved into operative position by the springs 25 and as theclutch rotates with the crank shaft through the usual cycle, the roller9 comes in contact with a cam 23 secured to the clutch member 7. Thisdisen- 'gages the clutch at the completion of the cycle according to theadjustment of the bushing From the foregoing description it will beunderstood that the trip device may be adjusted with the greatestprecision merely by turning the bushing 17 within the bearing 18 andwithout touching the trip lever 13. 'VVhile I have shown and describedin detail the preferred embodiment of the invention, it is apparent thatthe same'may be considerably modified without any material departurefrom the scope of the appended claim.

WVhat I claim is:

The combination with a rotatable clutch member, of a plunger normallyengageable l'with said clutch member to throw the latter out ofengagement after each operation, a

split bearing having an eccentric bushing in which the plunger ismounted, said bushing having a head at its lower end for adjusting itcircumferentially, transverse bolts intersecting said bearing andadapted to clamp the "same on said bushing, said bushing havingcircumferential grooves engaged by said aolts to prevent longitudinalmovement of the bushing while it is adjusted, said plunger having areduced cylindrical portion terminating in a head, and a trip leverhaving arms straddling said reduced portion and engageable with saidhead to shift the plunger longitudinally out of engagement with theclutch member, there being sufiicient clearance between said arms andsaid reduced portion to permit the bodily adjustment of the plunger bythe rotation of said bushing Without moving said lever.

In testimony whereof I heve hereunto signed my name to thisspecification.

NEAL W. DORMAN.

